Command line is a very powerful feature in AutoCAD, and I don’t think replaceable. I know there are a lot of pros and cons about using command line in AutoCAD. Personally I like using shortcut key when using AutoCAD, but I found that it’s difficult for people who rely heavily on this when learning other CAD application.
But doesn’t matter. When you use AutoCAD, you’ll want to use it optimally right?
You can see and customize your aliases by accessing edit aliases in AutoCAD ribbon, manage tab, customization section. Or if you use AutoCAD classic interface, you can access it from menu tool>customize>edit program parameters (acad.pgp) This will open your acad.pgp file in text editor (by default it’s notepad). As you can see, this is a list of all your command aliases. Mine is default, so aliases for line is L. When I type L then [enter] will activate the line tool. Typing LA [enter] will open the layer manager. Etc. AutoCAD commands don’t work like any other Windows applications. In Revit or Inventor, you simply type two character to activate a tool. No need to press [enter]. But in AutoCAD you can use single character, or more than two. MicroStation can do some similar key-in, but command line is not always have the input focus. Using command line in other application might not be as comfortable as in AutoCAD for AutoCAD users. I suggest you not depends on command line so much, unless you don’t plan to use other CAD applications. You can edit the aliases and change them to what you want. After you finish, save this file. You might need to restart your AutoCAD after doing your modification. (Or you can run REINIT to reload your acad.pgp – thanks to Alex Serdakowski) I have comments from Alex Serdakowski and Marty saying that there is another way to do this. We have to use express tool to do this. This tool name is Command Alias Editor. You can access it from menu: Express>Tools>Command Alias Editor. It’s a great tool that I missed. If you haven’t had express tools installed, then you can’t use this tool. You can see the whole AutoCAD command in AutoCAD help file. See under command reference>commands. But do you really want to remember all of them? :) 
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Application Engineer. Jakarta, Indonesia.
5+ years experience as CAD engineering application. AutoCAD, MicroStation, Inventor, Autodesk Revit Architecture 2010 certified professional, and certified CATIA part design specialist. Here are some topics I am currently focusing on 
There is an easier way of accessing and managing AutoCAD Aliases. There is an Express Tools function that does just that.
In the Express Tools tab, the Tools section contains a Command Aliases button that calls a dialog box listing all Aliases (the same that are defined in the ACAD.PGP file). It lets you Add new Aliases, Remove or Edit existing ones. Also, when you exit the Command, it automatically reloads the ACAD.PGP file so you have access to your new or modified Aliases right away. By modifying Aliases directly in the ACAD.PGP file, you either need to reload AutoCAD or issue the REINIT command to reinitialize the ACAD.PGP file.
Alex Serdakowski
Thank you Alex, for the valuable information.
I never aware about this before.
Like anonymous said there is a better way, and if you like the command line, that better way is accessible via the express tool command ALIASEDIT
hi there I am just using the new aliasedti function and I think it is great ,
But is there a way to ,like in autohook to have the enter function added to the shortcut aswel?
so if I define Q for polyline that I donot have to rightclick or press enter after te Q keystroke?
Thanks in advance
Peter
No, you can’t.
That is exactly why I wrote that Autodesk supposed to change the command line behavior. It works great for veterans, but for the new generation that use many (new) applications, command line can be annoying.
If people are familiar with DOS, then command line is great. But when you are using iPhone or iPad, playing Wii… then command line maybe feels a bit ‘old’.
But I do understand that this will be hard for existing AutoCAD users, and will not be easy to please them both.
So for the new guys, probably ribbon shortcut is the answer. Microsoft also use it anyway, so you can use it in Microsoft Office and other applications.